Feekoon Quiet Vent Fan Booster, 4" x 10" Smart Register Booster Fan with Fan Booster and Thermostat Control, AC Vent Booster Fan, Heating Cooling AC Vent, Increase Airstream from Registers (1 Pcs)

Smart Register Vent: the smart register vent cover is designed to boost your existing AC or heater's airstream, to achieve a more balanced cooling and heating effect, Easy to Install: the air vent fan fits ONLY 4" x 10" register vents; Airstream: 140 CFM; Easy to mount on wall or floor vents in your home; Please note to measure the duct opening size before ordering, Quiet AC Vent Fan: our AC vent fan configured with stator blades, quiet PWM motor, and a built in sponge that can effectively absorb shock and sound, so that the noise of our vent fan booster can be controlled at 16Dba or below, Programmable LCD Display Controller: the air vent designed with clear LCD display, three simple buttons allow you to switch modes at will, and adjust temperature and wind speed flexibly, Quality Materials and Nice Workmanship: the vent boost is featured with anodized aluminum frame and thermoplastic casing with fan cover, safe and reliable; Motor contains dual ball bearing with a 67000 hours serve time